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Pancreatic tumors in mice have been reduced using a weakened strain of bacteria that leaves normal tissue untouched. The mice showed a drastic reduction in metastases when treated with radioactive Listeria monocytogenes. The method could be used to treat metastatic cancer in humans. The research was published in Proceedings of the National Academy of Sciences.

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Researchers combined titanium oxide, a compound that has antibacterial properties, with an Escherichia coli antibody and were able to eliminate of 90% of harmful bacteria within 15 minutes of activation while leaving beneficial bacteria untouched. Researchers say their findings show the potential for combining compounds with antibodies specific to certain bacteria to create targeted treatments.

Two new species of worms that feed on the bones of dead whales have been found in the chilly waters of the Antarctic. While studying what happens to bones and wood planks deep on the Antarctic seafloor, researchers discovered the worms, named Osedax antarcticus and Osedax deceptionensis, in abundance on the bones, but the wood came back untouched.

Scientists trying to understand the northern lights will study auroras on Saturn. They kicked off their month-long project with a live webcast from Hawaii's Keck Observatory. "We're hoping to get much more depth to the observations we have taken -- filling in a far more complete picture of the aurora as a whole, rather than disconnected parts," said astronomer Tom Stallard of the University of Leicester in the U.K.

A temple in the Valley of Oaxaca, Mexico, may have been used by the Zapotec civilization around 300 B.C. and could have been the site of human sacrifices. A human tooth and limb bone were found at the El Palenque site, along with burn boxes and residences that researchers believe housed the priests of the temple. Researchers say the temple was used until the end of the first century B.C. or the first century A.D., which means it's the oldest temple discovered in the area to date.

The Archangel Ancient Tree Archive in Copemish, Mich., is cloning redwood and sequoia trees in an effort to reforest the vanishing trees. The nonprofit planted redwoods for Earth Day this week in places including Australia, Ireland, Canada and the U.S. "If we get enough of these trees out there, we'll make a difference," said Jared Milarch, the group's executive director.